Power-driven hammer or riveter



March 151927' H, P. BRUMELL 1621103 v POWER DRIVENHAMMER 0R RIVETER 2 Sheets-Shed' 2 Filed Jan. 2o. 1926 V/ e5 I y?? I 4 y k f4 1// f @QV/.s221224 inea( ATTORNEY Patented Mar. 1,5, 127.

UNITED STATES l i i 1,621,103 PATENT OEFICE.

HENRY 15. BBUMELL, or Nn'w YORK, N. Y., AssIGNOE ro AJAX ELEc'rRIc HAimEB,

CORPORATION, or NEW YORK, N. Y., a GORPORATION or NEW YORK.

- POWERFDRIVEN HAMMER R RIVETER.

Application led `Tanuary 20, 1926. -Serial No. 82,466.

This invention relates to power driven hammers or riveters.

Prior power driven hammers or riveters with which I am familiar do not possess the 5 rigidity and endurance desired in practice,

the pounding and racking reciprocations of the plunger often impairing or wrecking the unit soon after it is put in use. I" or example the housing for the drive and the plunger is l peculiarly subject to the racking operations and the plunger guide is Often thrown out of alinement with the drivehousing with result-ant strains being put thereupon which approach the rupturing point, and this is l particularly true of that type of hammer includinga rotary motor, crank pin and double-cam drive-'mechanism wherein it is essential 'for satisfactory operation' and wear that the crank pindrive and the plunger i 20 occupy a predetermined fixed and vpractically unaltering relation with 'reference to eac otherthroughout the intended life vof the hammer. One Object of the invention, theref fore, is a novel casing construction and assembly for housing a hammer plunger and drive mechanism therefor includin a vspecial construction of guide and casing or the reciprocating hammer plunger and plunger drive which is peculiarly characterized by its .rigidity and its. ability to lwithstand the most ,severe operating-conditions' without premature impairment. A further object Of the invention is a. construction of this character which may be readily and quickly assembled into a' rlgid non-yielding structure and disassembled with equal readiness land facility. A further Object of the invention is a novel construction and arrange' ment of drive mechanism between the reciprocating hammer element and the rotary motor which lends itselfV to ready and quick assembly. Axstill further object of the invention is a casing and drive assembly for hammers of the above indicated character of simple construction 'and minimum parts whereby Athe manufacture thereof on a quantity production basis is facilitated and may be economically effected.

For a better understanding of the invention, reference may be had'to the accompanyingdrawings forming a part of thisapplication wherein: Y Fig. 1 is a longitudinal sectional view through the hammer,

Fig.. 2 is a view at right angles to Fig.v

.unusually heavy in the vicinity of the re- .straight sides engaging a pairA of roller with certain parts removed and showing the drlve mechanism including the hammer element, and

Fig. 3 is an exploded view illustratingv the assembly and disassembly of the hammer.

Referring to the drawings where like numerals designate'silnilar parts throughout, I have illustrated my invention asem'bodied in a hammer including an electric motor `1 driving a hammer element 2.; The motor 1 1s journaled and carried within the casing parts 4 and 5, the casing part .4 having an extension 4' which cooperates with a cap orl cover member 6 to house the intermediate driving mechanism and to anchor the guide 7 for the plunger l or head v3 of the hammer element rigidly in alined ".position. The guide 7 may be of any suitable Or desired shape, but in the particular embodiment illustrated itis of hollow nozzle-like construction and has on its inner end or base a heavy circular `flange 8. The casing parts 4 and 6 have corresponding mating arcuate ecesses 9 1for the irception of the lcircular ange 8 w en' the p unger guide is gripped and held within the socket 9 formed be? tween the outer ends of the casing parts 4 and 6. The latter are thickened and. made cesses 9 and the circular ange 8 to firmly and rigidly hold the nozzle-like `guide 7 inoperative alined position. The drive Y for the hammer element 2 and plunger 3 includes a double cam 10 and 11 carried by the hammer element and a. rotary disc or turret 12 carrying a crank pin 13' which alternately functions with .the-'cams'lO and i v11 to reciprocate the hammer element 2 back and forth. 'The double cams 10Q-11 Aare formed in a slide block and thelatter i's preferably formed integrally with the hammer element 2 3. The slide block which includes the cams 10-11 slides back .and forth on Or parallel tothe dsc'12 with its'v guides 21, 22 which are disposed onopposite sides thereof, and in the relative posi-j tion4 shown to take up side thrustand render .the reciprocation ofthe hammer element-2 f 'as frictionless as possible.' The dim or turret -12Yformsa-part-of a unit including a circularf ball bearing ring 14, the verticaly stub shaft 15 upon which-the disc 12 is mounted andthe bevel gear 16.v The lower end of the shaft 15l is carried by a ball bearing .unit 11 cap or casing part 6 and lifting the guide 7 and the hammer element 2 from the casing 4. The bevel gear 16 automatically meshes with a smaller bevel 18 on the end of the motor shaft when the disc unit 1 2 is inserted in position. `As indicated above, the

`hammer element 2 together with its double cam drive 10 and l1 slides hack and forth across the uppersurface of the disc unit l2 and the ball bearing unit 1l.`an opening 23 .being provided between the mating end walls of the casing parts 4 and 6 to accommodate the reciprocatinghammer element.

Fig. 3 indicates the facility with which the assembly and disassembly of the essential elements of the hammer may be elfected. The rotary disc or turret 12 and the parts carried thereby are lowered into position within the casing first with the lower end of the stub shaft 15 supported by the ball bearing unit 17, the extension 4 of the casing being adapted to receive this unit in a snugly fitting manner. The hammer element. 2 may then be inserted withinthe plunger guide 7 and these two elements may then be assembled into position with the circular flange 8 resting 1n the arcuate recess 9 formed in the thickened and strengthened part of the extension 4, and with the dou-ble cam 10, 11 straddling the driving crank pin 13 and disposed between the roller guides .21, 22. The parts are then in operative position and the casing or cap part 6 may then be assembled into mating relation with the extension part 4 to irmly grip and rigidly hold the guide 7 in alinement with the reciprocating hammer element 2 with the plunger 3 guided in the `hollow chamber formed therein. AThe casing parts 4 and 6 may be fastened together in any suitable manner, the guide 7 with its cylindrical flange 8 formed on the base thereof being rigidly retained in operative position without the necessity of any securing bolts or other fasteningmeansl which would be more or less subject to wear and breakage incident to the hammering operation. Even when the plunger 3 strikes the shoulder 25 of the nozzle carrying theftool, the shock is distributed .over the entire side surface of the flange 8 'and the correspondingsurystructure? are not de endent upon lscrewv'threads to receive an faceY of the arcuate recess 9, and these parts are .designed as described above to withstand these shockswhen distributed in that manner. The yrigidity and permanency of the withstand the hammer thrusts, and there are no bolt heads to interfere with the operators hand during operation. The cap or casingl 6 is observed to slightly overlap the ball bearing ring unit at 19 and thereby to firmly hold and retain the disc 12 and its unitary parts'. firmly in position.

The motor l may be assembled into position byv simply inserting it longitudinally within the cylindrical casing part 4 with the shaft and gear 18 'projecting into the extension 4 and then bringing the end casing part 5 into abutting relation with the part 5 to form an end housing for themotor and to carry the bearing unit therefor. Either the motor or the bearing unit including the gear 16 may be inserted into posi? tion first. the gears 16 and 18 automatically@ meshing with each other in either event. The

casing part 5 includes a hollow handle part 5 formed integrally therewith as `a hand hold for the operator ofthe hammer. The drive chamber formed by the casing partsl 6 and 4 is provided with openings for inspection and for the introduction of suitabhl lubricant, suitable screw threaded plugs 2l) being utilized for closingthese openings.

In the construction illustrated the entire casing consists of four parts 4, 5, 6, 7 which may be manufactured on a quantity production basls as for example by casting, with the corresponding reduction in cost-of production, and the small number of parts together withtheir simplicity in construction contribute to a ready and uick' assembly and disassembly for inspection and replacement of parts.

Having thus described my invention, what I claim andv desire to protect by Letters Patent is:

1. In a power driven hammer including a reciprocable hammer element and a drivemechanism directly connected therewith, a nozzle-like guide for-the reciprocating hammer element and a. pair of mating casing members adapted to enclose the drive mecha vnism for the hammer element and being of a construct-ion to firmly grip and rigidly hold'said guide in operative alined position with respect to the reciprocable hammer element when the casing parts are fastened together.

2. In a power driven hammer including'a reciprocable hammer element and a drive therefor, a guide member having a guide chamber therein for. the reciprocable' ham-l mer element and a lateral' projection on one `end thereof, and a pair of casing matingl members adapted to house the driving mechanism for said hammer element and containing a retaining recessforthe recepytionfof .the projectiono'nsaid guide member when the casing parts areassembled together, whereby the guide member is rigidly supported. in operative alinement with the reci rocating hammer element.

3. apowerdriven hammer including a ing hammer element, said vheavy extensions;

recesses, and

. ciprocatin `reciprocable hammer element and a drive therefor, a nozzle-likev guide having a guide chamber therein for the reciprocable hammer element and a circular laterally projecting flange on one end thereof, and a pair of mating casin members adapted to house the driving mec anism for said reciprocating hammer element, includin a socket portion disposed outside of the rive chamber together with arcuate recesses to receive sald nozzle-like guide with its circular flange and 'to hold the same rigidly in alinement with said reciprocating hammer element when the casing parts are brought into mating relation.

4. In a power driven hammer including a reciprocating hammer element and a drive unit therefor, a pair of casing members adapted to house said drive unit, said casing members having heavy rigid extensions which are adapted to form a socket for the reception of a nozzle-like guide for the rehammer element, said hollow guide proJecting beyond said rigid extensions and having a part disposed within said socket and rigidly and xedly retained in alined position by said cooperating mating casing members when the latter are fastened together.- A

5. In a power driven hammer, `a pair of mating casing members which are adapted to house a driving unit, said casin parts having outside the chamber formed t erebetween integral heavy mating extensions adapted 'to form therebetween` when assembled a cylindrical socket for the receptionvv of a nozzle-like guide member for the reciprocatalso including mating arcuate a nozzle-like guide member dis ose'd within the socket formed between the eavy extensions and having a heavy circular flange retained with the mating arcuate recesses of the casing parts, whereby the nozzle-like guide member is gri ped and rigidly retained in operative a inement.

6. In a power driven hammer ,a rotary drive unit including a rotating driving crank pin', a reciprocable hammer element having a double cam functioning alternately with the crank pin to reciprocate the hammer. element in a plane of rotation of thel crank pin, a pair of mating casing members which are adapted when assembled to house said rotary driving unit with anopening therethrough for the reciprcation of the hammer element, said casing parts having outside the chamber formed therebetween integral heavy mating extensions forming therebetween ay cylin- -plane parallel with the be drical socket chamber and a hollow noazlelike guidemember` for the reciprocating hammer element having 'a part rigidly carried within said socket andprojecting beyoud the mating extensions for guiding the reciprocating hammer element therealong. 7. In a ower driven hammer'including a reciprocab e hammer element and a drive unit therefor, a guide for the reciprocating hammer element, a pair of mating casing members inclosing the drive unit 'and carrying said guide, one of said mating members being constructed to receive the drive unit in operative position and the other being adapted to engage the ydrive funit when brou 'ht into matingA relation with the corres on ing mating member and thereby retain t e drive unit in operative relation with respect to the reciprocating hammer element. 8. A hammer of the character set forth in claim 7 -wherein the guide for the reciprocating hammer element is carried within a socket formed between the mating members land includes la circular flange rigidly `re- 9. A power driven hammer including a i power motor housed in a casing divided transversely thereof, one of said transversely divided parts having a longitudinally divided part including an integral extension for receivin and holdingan intermediate drive, a gui e l element carried by said extension and the mating member for the integral extension encloslng the intermediate drive and gripping the guide member when brought into matin re ation with the integral extension. v10. ower driven hammer including a reciproca le hammer element .and drive therefor, a pair of mating casing members adapted to enclose the drive mechanism and the reciprocable hammer element, a nozzle like gui e having an enlarged central-longitudinal. chamber at its rearward'end for reception of a part of the reciprocable hammer element and having :a smaller guide opening through the outermost end thereof and communicating with the other chambe, the smaller chamber being adapted -to receive a suitable tool, and the matin rs beingI of a construction to fir y grip and rigidly' hold said nozzle/ like guide in operative alined position with. respect to the reciprocable fhammer element 0when the casing parts are fastened together.

In testimony whereof, I"have signed my name to this specification.

member for the reciprocating meml HENRY P. BRUMELL'. i 

